[Gta04-owner] gta04 hardware revision -- how to check?

Orest Tarasiuk orest.tarasiuk at tum.de
Thu Jan 17 19:50:24 CET 2013


OK, thank you for the fast and thorough answer! :)



//
On 17/01/13 18:17, Dr. H. Nikolaus Schaller wrote:
> Hi Orest,
>
> Am 17.01.2013 um 17:59 schrieb Orest Tarasiuk:
>
>> Hi!
>>
>> Just a short question: does anyone know a quick way to check the hardware revision of a gta04?
> Short question usually lead to long answers :)
>
> The easiest way is to directly look at the board.
>
> It is intentionally not made easy to directly read the hardware version... Because it is too
> tempting to base user space code on that.
>
> The better solution is to base user space code on existence of features, i.e. the
> hw-revision is hidden by the kernel and indirectly shown.
>
> And, there may be board revisions with different components installed/not installed.
> They all have the same revision code. So it is more a PCB layout version code which
> indicates different wiring options. Not necessarily what the board has or does not
> have installed.
>
> I am not sure which kernel you use, but the set of GPIOs presented in /sys differs
> between A3 and A4. Especially the one to control the UMTS modem.
>
> That said, there is code in the hw-validation kernel that prints the board version
> to the initial lines of dmesg. So you can boot and then just dmesg | more.
>
> BR,
> Nikolaus
>
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